Huazheng HZGC3521 Series, Руководство пользователя

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Three-phase energy meter field calibrator
After entering the interface, the scale shows the content of A-phase current and voltage
harmonics, and the largest first harmonic of the scale line is full degree. If the harmonic is very
small, only a few millionths, such as a maximum of 0.06%, the percentage of the highest scale is
0.06%, and the subtle harmonic is amplified at a glance.
Press 【 F1 】 key, Ua is the harmonic diagram of A-phase voltage scale line; and Ia is the
harmonic diagram of A-phase current scale line
Press
【
F2
】
key, Ub is the harmonic diagram of B-phase voltage scale line; Ib is the harmonic
diagram of B-phase current scale line;
Press
【
F3
】
key, Uc is the harmonic diagram of C-phase voltage scale line; Ic is the harmonic
diagram of C-phase current scale line.
The instrument can test a total of 2 ~ 21 harmonics or 2 ~ 51 harmonics, a harmonic spectrum
is made, and the percentage content of each harmonic is given. In the following, 21 is an example
and used for calculation and as example (the algorithm of 51
PP
st
PP
harmonic is the same as 21st)
Harmonic harm: harmonic pollution to the grid is worsening day by day, and the resulting
harm can not be ignored, mainly reflected in:
1. Greatly increasing the possibility of resonance in the grid, resulting in very high over-current
or over-voltage to cause the risk of accidents;
2. Increasing the added loss, and reducing the efficiency of power generation, transmission